Heavy Object

Qwenthur and his unit are sent to oversee a hostage trade with the Intelligence Union, where they are sending Guru Klondike to them in return for valuable intelligence. Due to the importance of the Guru, the Capitalist Enterprise and Faith Organization send their own Objects to observe. However, Baby Magnum is hacked, and Qwenthur and Havia go to investigate the source when they are warned by Charlotte that Flide is responsible.

With Baby Magnum, Snow Quake, and Active Sledge disabled, City Slicker proceeds to lead his seven Objects to destroy a nearby immigrant city. Granny, fearing for her family that is living in the city, abandons her post to try and rescue them. Meanwhile, Qwenthur deduces that City Slicker's sick extra Objects are actually decoys, with inferior armor and run by an AI. Before he and Havia can do anything, they are captured by the Battlefield Cleaning Service, a Capitalist Enterprise private military company who are trapped on Victoria Island due to a failed operation. Qwenthur uses a stash of diamonds he stole from the Kamchatka mines to hire the Battlefield Cleaning Service to assist him in stopping City Slicker. They then contact Granny and tell her to return to her post and repair Baby Magnum, as they will handle the defense of the city.

The group is rescued from Nutsley's attack by one of the antiwar civilians, and Qwenthur and Havia then lead Nutsley into a trap, killing him. Qwenthur then heads for the surface to witness the battle between Baby Magnum and Wing Balancer. Realizing that Wing Balancer requires delicate IR sensors to control its landings, Qwenthur uses an IR laser to disable one of the sensors, causing the Wing Balancer to land improperly and cripple itself and is subsequently destroyed by Baby Magnum. However, even with hostilities over, another Legitimate Kingdom Object, Indigo Plasma, arrive and destroys mines to eliminate the antiwar activists. Fortunately, Frolaytia managed to warn the activists in time for them to safely escape the mines. Qwenthur then realizes that Nutsley was not working for the Faith Organization, but for a radical faction of the Legitimate Kingdom. With Indigo Plasma's treachery, a civil war within the Legitimacy Kingdom is inevitable.

Qwenthur and Havia are tasked with assisting on an offensive against the Faith Organization's coal mines in Kamchatka. Qwenthur is tasked with leading a team to hack the Faith Organization's surveillance UAVs, allowing a team led by Havia to sabotage a radar facility and giving Milinda an edge over the Wing Balancer, the Object defending the mines. Accompanying Qwenthur's team is Charlotte Zoom, an oversight officer who is interested in Qwenthur. Unfortunately, before they can hack the UAVs, Nutsley, one of the team members, betrays them and shoots both Quenser and Charlotte in the back, leaving them for dead.

Qwenthur and Havia are sent back to Alaska in order to destroy the Water Strider's remains and prevent the Information Alliance from gathering any valuable data from it. Opposing them is the Elite codenamed "Ohoho", who battles Milinda, but both Objects disable each other. Qwenthur moves to sabotage Ohoho's Object by climbing aboard and breaking into the cockpit.

With the Break Carrier destroyed, the Legitimate Kingdom pursues the remnants of the MDC to the abandoned Amazon City, where Qwenthur and Havia are given the mission to assassinate the MDC's leader, Sladder Honeysuckle. However, Qwenthur notices that the MDC isn't trying to run, but instead trying to hole up in the city. The Capitalist Enterprise warns Froylatia that Honeysuckle is attempting to seek asylum with the Intelligence Union, and that the Intelligence Union is preparing to invade Amazon City to rescue him. Realizing that the Capitalist Enterprise will intervene to prevent Honeysuckle's escape, Froylatia orders her forces to accelerate their search to prevent a potential 4-way battle.

The Bright Hopper is destroyed while en route to the battlefield by the Mass Driver Conglomerate's ultimate weapon, a railgun capable of firing artillery shells at a velocity of Mach 25. The MDC then attempts to target Baby Magnum, but thanks to a timely warning from Qwenthur, Milinda is barely able to dodge the attack, but Baby Magnum still suffers heavy damage. Meanwhile, the Bright Hopper's support forces arrive and announce that they plan to disable the MDC's Object by destroying a dam and flooding the entire Iguazu region, despite the fact that it would kill tens of thousands of civilians. Havia goes to stop the destruction of the dam while Qwenthur and Froylatia move to scout the enemy Object's (dubbed "Break Carrier") location. Froylatia then tells Qwenthur how she joined the military in order to avoid being forced into an arranged marriage, and that Halreed was one of her potential suitors. They then hear the Break Carrier approaching, but cannot pinpoint its location.

Qwenthur and Havia are sent to a reconnaissance mission in Antarctica and confront a terrorist force that has occupied a Legitimacy Kingdom research station. After Milinda destroys the sentry guns defending the outpost, the duo discover that the terrorists are attempting to hack a military satellite so they can fire its laser at a remote lunar resort. Since the target is a mutual enemy of the Legitimacy Kingdom, Froylatia orders them to allow the terrorists to fire the laser. Havia then finds out his fiance is at the targeted resort and "accidentally" interrupts the hack, saving her life. Meanwhile, Milinda finds evidence of a submersible Object having recently been in the area.

After defeating the Oceanian soldiers and stopping the massacre, Qwenthur and Havia learn from Froylatia that Oceania plans to use their Object to destroy more villages and frame the joint task force for the atrocities, thereby turning public favor against the joint operation. The joint task force heads off to the suspected hiding place of the Oceanian Object, but Qwenthur realizes that it is a decoy and deduces the Oceanian Object's true hiding place.

With Milinda facing the hostile Object, Qwenthur and Havia's part in the battle seemed over, but the enemy Object begins systematically disabling Baby Magnum's weapons. Qwenthur uses a series of mines to damage the Object's rudders, causing it to break apart under the stress of its own high speed maneuvering.

Reunited with Milinda, Qwenthur and Havia infiltrate the enemy base looking for a way to disable the Water Strider and allow Frolaytia's forces to launch a counterattack, but things go south when Milinda is captured and it's up to Qwenthur to challenge all odds to make sure his plan works. He manages to sabotage the Water Strider's self destruct mechanism, causing it to explode and allowing Frolaytia to capture the enemy base. Qwenthur and Havia are hailed as heroes, and then are immediately transferred to a new front, much to their dismay.

The world is now fragmented into four coalitions that constantly wage wars across their many borders. These wars are fought by a new class of weapons called Objects, which rendered all other forms of conventional warfare obsolete.